Box joint



Patented Jan; 13, 1931 nnarnonn A. LANGE, or si Leers, "IISSOUBI f BOX JOINT application mea December 1a', m1.' 'semi Nq. 239,476.

invention relates to .joints or seams 'for the edgesof boxes 'formed of pasteboard, fiber board, laminated board', and similarmaterial; and pertains more particularly to 5 improvements en vv the forms -of box-joints disclosed in applicants prior'Patent 1,415,-

368 and his prior application, Serial 32,642. The jointsfof the sald patentandvthe said ap lcation are formed' on av definite line '1o an can not beshifted therefrom andmoreover rovidea reinforcing or bracing portion a. on the line of the crease. .'The joint ofthe said atent allows the material to be4 bent inwar yorso as tofclose the seam, 15 until theiiaps on either side ,ofthe joint are disposed at right lan les to one another; and. the joint ofthe sald" ap lication .permits- -the material to-.be folde at right angles and, also, one'hundred and eightydegrees Zoinwardly. v rlhe present invention contemplates the provision of'a joint thatjnot only presents a definite line` on which\the flaps can be folded inwardly at right a les, but that,

25 also, allows the fiapsto be fol ed outwardly against themselves lor one hundred and elghty degrees. Such an outwardly. fold-f, ab

e seam is of use, for instance, where the cove iaps of an erected box that are so dispose be folded back to allow the box to be filled or tied. The invention, also, vaims to romdp vi e a jomt of the character descrlbe 1n which the llaps'will be braced by a'reinforc- `ing portion when they are folded inwardly at r1ght an les. Other objects l and a vantages wi be a parent during the course of the following escription of a preferredv joint ofthis invention; and

- .Figure 8is an end 'ew .of the vbox blank.

around the opening thereof must showing the ap arance of :the seam or. joint l after the material has been folded outwardly upon itself thereon;v i.

Flg'ure 4 isan end view of theiin-aterialt-asv ltappears after having beenjbent inwardlyI v'w1th the apsonjeitherside.ofthe-seam disi posedat right angles .to one another; A-

VFigure 5 1s-an` end viewdepicting .the flaps foldedou'twa'rdly -ne 4hundred and ,eighty degrees; A

Are 6 is a fragmentary en d viewv exl hibiting. the Y:relation of overlapping flaps to the'joint afterv the blank of'imaterial` of Figure 7 has vbeen folded, into box `formation.;

blankV that has been .creased 'to` provide the ofF1gure7. v

After the sheet of material llhas been" creasedbetweenmale and female die members 2 and-.3,v respectively .(Figure" 1 and removed. therefrom, it presents` the appearanceexhibited-.in Fi re'-2.. The Amaterial isthenl bent '.outwar ly on the joint upon-v .itself and then I back again, .causin it to take the formvshown` in Figure .3. t will be observed that .the seam orv'joint is. U-

"shaped in cross-section, or `of 'channel fordiate web portion 4 an flangeportions 5 and 6 -that connect ,the -web portion .4 to l respective lia s `7` and y8 vron either side of the` seam. vT e internal corners!) V.and 10' that vaire included between the web 4 andthe respective langesf `and I6.are sharp, asf arek theinternal corners llfand 12 thatare'inf eluded between the lian es 5 and 6 and their respective adjoining y same extent in flanger 6 vas they are in flange 5 bythe upsetting action of the die. When, therefore, the flaps '.7 and are bent' inwardly to the position shown in Fi vv1e-"4, the bending will be definitely localizezlfbout the corner 9 as an. axis. The web portion 4 ps 7:. and-"8. The flange 'portionv 61 isf shorter than the` flange 'port1on`5,andl is, therefore, notas iicxible as thelatter, :since the vlayersfof ther material are vnot loosened from Ione another.r to the` so mation, the. channel. com rising an intermeternal corner 9 as an axis, the excessory bulge of material 17 reduced by the bending action occurs on t e outside of-the box;

r and this effect, together with the interfitting and dovetailing of. the `adjacent parts on the inner side of thezfcoriner,lv enables the presentation of continuous inner plane surfaces 16 and-18 substantiallyA at right angles to each other? r rvrWhen the fiapsare foldedoutwardly, the

bending voccurs abouty the corners 11' and `12 as axes,as,shown 'in Figure 5. y

Figures 7 and 8 exhibit the joints ofthis invention embodied in a box blank'comprising an-inner row of' flaps 19,20, 21, 22an'd 23, and respective 'outer rows .of flaps 24, 25, 26, 27-an`d 28, 29,*30,`and..31. When Ythe blank is folded into box formation, they adjacent outer flaps can not be in the same plane, but must overlap, as will beunderstood by those skilled intheart. Itwill be observed in Figure 6 that 'the adjacent flaps 26-can not bendl about the corner 10 as' an axis, even though flap 27 tends to push flap ofthe blank of Figure 7 ma be continuous,

and need not be staggere alternately at successive adjacent outeria sito enable the` flaps to overlap when folde While all the features of this invention are believed to be combinatively novel, -certain of the features are manifestly also,

capable of individual 4use,fwithout"t e cooperation of' other i features of thev inven-v tion. For instance, without departing from` the spirit of the invention, the bottom 14 of the channel may be wider than vin the specific form shownA inthe drawing, so that theshoulder 15 of'iiap 8 does not abut against the face 16 of'flap7.

vI- Iaving thusy fully describedthis invention, I hereby reserve the benefit of' all changes in form, arrangement, order, or use of parts, as it is'evident 'thatmanyfminor changes may be made therein without departing from the spirit ofthis invention or the sco e of the followinglclaims..

Iclalm: f Y 1. VA sheet of material having a seam of channel 'formation comprising` an intermediate web portion and iange'portions that connect the web portion of the channel to respective fiaps on either sidel of the seam, the dimensions of the channel being such that, when the flaps are folded at right 'angles so as to close the channel, one of the flaps defines *a shoulder that abutsagainst theinner surface of the' other flap to define iaps presenting continuous inner plane surfaces substantially at right angles to each other. 2. A sheet of material having a seam of channel formation comprising a fiat intermediate` web portion and iange portions that connect said iat web portion to respective flaps on either side ofthe seam, said -web portion having its inner surface equal in width to the height of the inner side of one of the fianges so'that said side completely closes said channel when the flaps are folded. y' v 3. .A sheet of material `having a seam of channel formationy comprising an intermediate web portion and flange portions that connect the web portion of the 'channel to respective flaps on either side of the seam,

the dimensions of the vchannel Abeing such that, when the flaps 4are foldedat right angles so as to close thechanneh one of the f flaps deiines a shoulder thatabuts against the inner surface of the; other flap' to brace the;4 flaps against -further closing.

' In testimony whereof Ihereunto aiiix my signature. f l

l kBELRTHOIVD A.. LANGE.

Vwas 

